Some of the fruits of treating the people nicely

"There's nothing more beneficial for the heart than treating the people with kindness and wishing good for them. Because by treating the people in that way, then;

if it is a stranger you will gain his love and affection,

if it is a friend and beloved one you will maintain his companionship and love,

and as for a hated enemy then you will extinguish his firebrand with your kindness and suffice against his evil."

He (رحمه الله) also mentions:

"The one who treats the people in a nice way and has good suspicion about them, his intention will be in a good condition, he will feel at ease, his heart will be well and Allah will protect him from any evil and calamities."